Malicious PDF — malware analysis report

Static analysis result for SHA-256 192c87a76ee3c980…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 03:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db997b0a298cc4e15d4e90d7a10039a2 SHA-1: c738039b6f2f34d1a6f016acc1fc8e18a21c49f8 SHA-256: 192c87a76ee3c980212bdd1548ab3fff99784121bffc554c6ca5abbf9e565af1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=spiritual+words+that+start+with+y PDF link annotation
    • http://phongkhamthienhoa.vn/images/files/kobinesazewuzezugopijile.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/7379396208.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/mosojesujogetabagew.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/jinatuxotuzamefeladika.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/rezezuda.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gagevesajodizogabamis.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/97832685360.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c59b1344416f5933bba94bcea2c9d070/32521556189.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109140700471473.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/pejugefuxigeninonini.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/38926263631.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140061d20b5b---85875574670.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80735374137.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/56403131348.pdfIn PDF document text
    • http://markone-tools.com/upload/files/fixipokipasan.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/sonosenobivudogaxemotoxoj.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/55606941751.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/5411546646.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/999469796.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33665010600.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 10628 bytes
SHA-256: cde846dc669855f30bba8c104177d42188632c198bd8be42f569ced3314d0dc9
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 17936 bytes
SHA-256: e0bd982b4b34a6bb4d2c8e90feea915e810440207ff1132ba79349aec9bea876
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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